36 results about "Electrode adhesive" patented technology

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a self-repairing type lithium ion battery positive electrode adhesive, a preparation method, positive electrode slurry and a positive electrode plate. The adhesive comprises a mixed solvent, and a first copolymer serving as a main component and a second copolymer serving as a cross-linking agent are dissolved in the mixed solvent; the first copolymer is an acrylate-based multipolymer containing carboxyl or hydroxyl; the second copolymer is isocyanate terminated UPy functional polyurethane; the adhesive is in a liquid state at room temperature, when the adhesive is subjected to vacuum heat treatment at 60-180 DEG C, carboxyl or hydroxyl in main components of the adhesive reacts with isocyanate groups of a cross-linking agent to form amido bonds along with volatilization of a mixed solvent, and UPy groups are associated through quadruple hydrogen bonds to form dual dynamic cross-linking points. The method can effectively adapt to the volume change of the positive electrode material in the lithium removal / insertion process, and maintains the integrity of the electrode structure, thereby improving the cycling stability and rate capability of the lithium ion battery.

The embodiment of the present application provides a positive electrode material, a secondary battery and an electric device, wherein the positive electrode material comprises a core and a coating layer arranged on the surface of the core, the core comprises a sodium ion layered oxide, and the coating layer comprises a spinel lithium salt. In the embodiment of the present application, the layered positive electrode material is tightly coated by the spinel lithium salt, so that the problem that the interface impedance of the positive electrode material of the existing sodium ion battery is large and the positive electrode adhesive is easily attacked is solved.

The invention relates to the technical field of secondary batteries, and discloses a secondary battery, a negative active layer in a negative plate comprises a negative active material and a negative adhesive, the negative active material comprises a silicon-based material, the negative adhesive comprises a polymer, and the raw material of the polymer comprises a hard segment monomer and a soft segment monomer; the electrolyte comprises carbonic ester substances and lithium salt; on the basis of the total mass of the raw materials of the polymer, the mass content of the soft segment monomer is r%; on the basis of the total mass of the electrolyte, the mass content of the carbonic ester substance is t%; t / r is greater than or equal to 0.234 and less than or equal to 1.770. According to the secondary battery provided by the invention, the chemical structure of the adhesive is optimized and the composition of the electrolyte solution is adjusted, so that the excellent electrochemical performance of the battery is ensured, the swelling effect of the electrolyte on the adhesive is reduced, the cycle life of the battery is prolonged, and the safety of the battery is improved.

The utility model provides a rubberizing mechanism and rubberizing device.The rubberizing mechanism comprises a rack, a transplanting assembly and an adsorption assembly, the transplanting assembly comprises a lifting module, the adsorption assembly comprises a first adsorption structure, a second adsorption structure and a driving structure, and the lifting module is in driving connection with the first adsorption structure and a first driving part; the first adsorption structure adsorbs the part, corresponding to the top surface of the battery cell, of the adhesive tape, the second adsorption structures are arranged on the two sides of the first adsorption structure in pairs, the second adsorption structures adsorb the parts, corresponding to the large surfaces of the two sides of the battery cell, of the adhesive tape, and the second driving part is in driving connection with the two second adsorption structures arranged in pairs; and the second driving part drives the two second adsorption structures to get close to each other or get away from each other. According to the application, the cooperative work of the first adsorption structures and the second adsorption structures is adopted, so that the adhesive tape bonding efficiency is improved; therefore, the problem that the battery cell packaging efficiency is affected due to poor applicability of the rubberizing mechanism of the pole piece in the prior art can be solved.

A tetrafluoroethylene-based polymer composition for use as an adhesive in electrochemical devices is provided, which can reduce the resistance of electrochemical devices and also provide adhesive sheets with excellent adhesion to substrates. This is further explained by the use of the same composition in adhesives, electrode adhesives, electrodes, and secondary batteries for electrochemical devices. Specifically, a tetrafluoroethylene-based polymer composition for use as an adhesive in electrochemical devices is provided, wherein the tetrafluoroethylene-based polymer composition has polar groups, the content of which is less than 0.020 meq / g relative to the tetrafluoroethylene-based polymer composition, the tetrafluoroethylene-based polymer composition is non-melt processable, and the apparent density is less than 0.50 g / ml.

This invention relates to the field of lithium battery negative electrode adhesive preparation technology, specifically to a method for preparing aminosulfonated cellulose salt and its application as a lithium battery negative electrode adhesive. The preparation method includes the following steps: S1, adding sodium carboxymethyl cellulose to an ethanol-water solution and reacting with sulfuric acid to obtain a first product; S2, adding the first product to an ethanol-water solution containing modified nano-calcium carbonate and adding sodium aminosulfonate dropwise to obtain a reaction solution; S3, adding sulfuric acid dropwise to the reaction solution to obtain a second product; S4, adding the second product to an ethanol-water solution and reacting with an alkaline solution to obtain a third product; S5, drying and pulverizing the third product to obtain aminosulfonated cellulose salt. The aminosulfonated cellulose salt prepared by this invention, when applied to the adhesive of the lithium battery negative electrode, can effectively improve the overall flexibility of the material and extend the battery's lifespan.

The invention discloses a solution type negative electrode adhesive as well as a preparation method and application thereof. The preparation method of the adhesive comprises the following steps: a, mixing and stirring polyacrylonitrile fibers and a modifier in water, and treating to obtain a pretreatment solution; b, uniformly dispersing the pretreatment liquid obtained in the step a by using a high-pressure homogenizer to obtain polyacrylonitrile fiber dispersion liquid; c, mixing and reacting the polyacrylonitrile fiber dispersion liquid, unsaturated monomers and an initiator to generate a polymer, and taking out a precipitate; and d, adding the polymer precipitate into water, and adding a neutralizer to adjust the pH value so as to prepare the solution type negative electrode adhesive. According to the invention, the PAA adhesive is modified by a special means, so that the embedding and de-embedding efficiency of lithium ions in the silicon-carbon / silicon negative electrode is improved, the surface cracking and powder falling of a pole piece caused by volume expansion of the silicon-carbon / silicon negative electrode in the charging and discharging process are avoided, and the cycling stability and the cycling efficiency of the silicon-carbon / silicon negative electrode are improved.

The utility model belongs to the technical field of knurling of fireproof rolling shutter doors, and provides an efficient dispersing negative electrode adhesive preparation device which comprises a mixing preparation cylinder and a main body of the efficient dispersing negative electrode adhesive preparation device, an annular medicine mixing box is arranged on the periphery of the bottom of the mixing preparation cylinder, and a sealing door is hinged to the outer surface of the mixing preparation cylinder. After an adhesive enters the mixing preparation cylinder through the jet flow mixer, the adhesive falls on the impact plate and is dispersed on the screen plate, then the dispersed adhesive can slide down along the multiple flow guide strips, the adhesive passing through the multiple flow guide strips can form a dispersed water curtain, and then after the additive enters through the feeding opening, the water curtain can flow into the jet flow mixer to form a water curtain. The additive is dispersed along with the screen plate and is in contact with the flow guide strips forming the water curtains, so that the adhesive and the additive are in more uniform contact, and the adhesive and the additive need to pass through a plurality of groups of water curtains, so that the contact time of the adhesive and the additive is longer, and the reaction is more comprehensive.

This disclosure relates to a separator. The separator includes an electrode adhesive portion having a high binder content and formed on the surface of the separator to provide increased adhesion to the electrodes and improved processability during battery manufacturing. Therefore, the separator and electrodes are in close contact with each other to prevent gap formation, thereby providing an effect of improved resistive characteristics. In addition, the separator includes an inorganic coating disposed on the surface of a porous substrate, wherein the inorganic coating has a porous structure derived from the interstitial volume between inorganic particles, and thus the separator has appropriate porosity and sufficient electrolyte retention. Furthermore, because the separator includes an inorganic coating on the surface of the porous substrate, the separator ensures heat resistance and prevents shrinkage even when the internal temperature of the battery rises. This disclosure also relates to a method of manufacturing a separator. The method includes forming an inorganic coating and an electrode adhesive portion disposed on the inorganic coating in a single step by using the density of the inorganic particles and the density of the binder resin particles, and therefore has advantages in terms of ease of processing.

The invention relates to a preparation method and application of a phthaloyl gelatin adhesive. Gelatin and phthalic anhydride are subjected to a reaction, such that phthaloyl gelatin is prepared; preparing the obtained phthaloyl gelatin into an adhesive solution, and mixing the adhesive solution with beta-manganese dioxide and conductive carbon to obtain uniform positive electrode slurry; and coating a current collector with the positive electrode slurry to obtain the manganese dioxide positive electrode bonded by the phthaloyl gelatin. According to the invention, the phthaloyl gelatin is used as a positive electrode adhesive; a high-toughness adhesive network of the phthaloyl gelatin can better buffer stress and maintain the structural integrity of the electrode; the free carboxyl group optimizes the electrode-electrolyte wettability, constructs a zinc ion transmission channel, and promotes ion transmission kinetics under high magnification. The bio-based adhesive provides a new strategy for breaking through the stability and rate bottleneck of the zinc ion battery through multi-functional design.

This invention discloses a battery anode adhesive with a topological structure, its preparation method, and its application, belonging to the field of lithium-ion battery technology. The adhesive is prepared by bridging a hyperbranched polyamide intermediate with a carbonyl-containing copolymer through a nucleophilic addition-elimination reaction, forming a three-dimensional network with a topological structure. The adhesive prepared by this invention is water-soluble and can effectively disperse the anode material of lithium-ion batteries. Its topological structure, combined with multidimensional hydrogen bonds, tightly binds to the lithium-ion battery anode material, significantly improving the stability and cycle performance of lithium-ion batteries. After 500 charge-discharge cycles at 1C rate, the optimal capacity retention rate of the lithium-ion battery can still be maintained above 86%.

The present application relates to the technical field of lithium ion battery, disclose the full solid battery of composite solid electrolyte is adopted, the electrolyte is composed of polyethylene glycol methyl ether methyl methacrylate, 5wt%~10wt% polyethylene glycol dimethyl methacrylate crosslinking agent, 30wt%~70wt% NASICON type LAGP nanoparticles and lithium salt.The present application adopts in situ photopolymerization process, the composite material is used as unified medium and is applied to positive electrode adhesive and electrolyte layer simultaneously, realizes synchronous crosslinking solidification under the condition of pressure, constructs continuous three-dimensional ion transmission network and integrated interface of chemical bonding.The technical scheme effectively solves the problem of high solid-solid interface contact impedance and structural collapse caused by electrode cycle volume expansion, can effectively absorb the volume expansion stress generated in the process of charge and discharge of positive active material, improves the ionic conductivity, mechanical strength, high temperature resistance and long cycle stability of full solid battery.

The invention provides a positive electrode composite adhesive and a preparation method thereof, and relates to the technical field of positive electrode adhesives. The positive electrode composite adhesive comprises 20%-40% of anionic waterborne polyurethane resin with a polycarbonate type soft segment, 10%-25% of a maleic anhydride grafted polyolefin elastomer, 5%-15% of conductive nanoparticles, 1%-5% of a polycarboxylate anionic dispersant, 0.5%-3% of a thickening agent and the balance of deionized water. A water-based fluoride-free system is adopted, so that environment friendliness and high safety are achieved; the maleic anhydride grafted polyolefin elastomer is utilized to realize chemical bonding and elastic buffering, so that the pole piece is effectively prevented from cracking, and the bonding strength is improved; by combining the corrosion-resistant polycarbonate type polyurethane and the conductive nanoparticles, the electrolyte-resistant stability is ensured, an efficient conductive network is also constructed, and the cycle life and the rate capability of the battery are remarkably improved.

The present invention provides a binder for a secondary battery electrode, even when a silicon-based active material is used (the silicon-based active material is considered to be large in expansion and contraction due to charging and discharging). The binder for a secondary battery electrode exhibits a high capacity retention rate while suppressing expansion and contraction due to charge and discharge even when used over a long period of time compared with the prior art. Also provided are: a composition for a secondary battery electrode mixture layer, which contains the binder; a secondary battery electrode obtained using the composition; and a secondary battery. A binder for an electrode, which is a binder for an electrode of a secondary battery provided with a secondary battery electrode containing carbon nanotubes, and which contains a crosslinked polymer containing a carboxyl group or a salt thereof.

The application relates to the technical field of negative electrode adhesives, in particular to an acrylic negative electrode adhesive and a preparation method thereof. The preparation raw materials of the acrylic negative electrode adhesive include an acrylic polymer solution and a polyurethane polymer solution; the preparation raw materials of the acrylic polymer solution include a hydrophilic vinyl compound, a hydrophobic vinyl compound, an amide group-containing vinyl compound, water, a neutralizing agent and an initiator; and the preparation raw materials of the polyurethane polymer solution include a diisocyanate, a catalyst, an active hydroxyl group-containing polymer and an organic solvent. The prepared negative electrode adhesive has low modulus and high adhesive performance, is applied to battery negative electrode adhesion, effectively buffers the volume change of the negative electrode material during charging and discharging, and maintains the structural integrity of the electrode.

The utility model relates to cable connection tool technical field especially relates to a kind of armored cable connector of surveying and adjusting linkage instrument, it includes the main body connecting pipe and cable output end connected head to tail, the top end of main body connecting pipe is equipped with the fishing fish top middle and is equipped with the axial through wiring hole, bottom is equipped with anti-rotation slot, cable output end is equipped with sealed electrode rubber cap inside, bottom is equipped with output electrode, armored cable center work cable passes through sealed electrode rubber cap and is connected with output electrode;Armored cable is equipped with the anti-rotation pressing terminal matched with anti-rotation slot;Armored cable is equipped with upper pressing terminal above fishing fish top. The utility model provides a kind of armored cable connector of surveying and adjusting linkage instrument, by being equipped with fishing fish top, it is convenient to fish, by armored cable is inserted into main body connecting pipe and cable output end, reduce the working difficulty and workload in the process of joint production, reduce the corrosion degree of armored wire in the working process simultaneously, to reduce cable consumption.

The invention provides a preparation method of a lithium battery silicon negative electrode adhesive, which comprises the following steps: mixing a multi-arm high-molecular compound connected with an isocyanate terminal, carboxymethyl cellulose and polyacrylic acid for reaction to obtain the adhesive. According to the invention, carboxymethyl cellulose and polyacrylic acid are effectively connected through a multi-arm molecular structure, and the formed high-molecular compound has the advantages of carboxymethyl cellulose and polyacrylic acid, has good water solubility and adhesiveness, and also has excellent flexibility and viscoelasticity. When the silicon-based negative electrode material is applied to a lithium ion battery negative electrode, the volume change of the silicon-based negative electrode material in the charging and discharging process can be effectively inhibited, and the cycling stability of the electrode and the battery performance are improved.

This disclosure provides a separator for an electrochemical device and an electrochemical device including the same, the separator being able to improve lifetime characteristics by ensuring adhesion between the separator and an electrode, achieving an electrode adhesive layer with low resistance, and improving electrolyte impregnation. According to one embodiment of this disclosure, the separator for an electrochemical device includes: an olefin polymer porous support; an inorganic hybrid porous layer formed on at least one surface of the olefin polymer porous support; and an electrode adhesive layer formed on a surface of the inorganic hybrid porous layer that is not in contact with the olefin polymer porous support, wherein the electrode adhesive layer includes at least one adhesive portion and at least one uncoated portion in which no adhesive portion is formed, the total coverage of the adhesive portion being 20% ​​to 60% of the total area of ​​the inorganic hybrid porous layer, and the minor axis length of the adhesive portion being at most twice the thickness of the separator.

A tetrafluoroethylene-based polymer composition for use as an adhesive in electrochemical devices is provided, which can reduce the resistance of electrochemical devices and also provide adhesive sheets with excellent adhesion to substrates. This is further explained by the use of the same composition in adhesives, electrode adhesives, electrodes, and secondary batteries for electrochemical devices. Specifically, a tetrafluoroethylene-based polymer composition for use as an adhesive in electrochemical devices comprises a tetrafluoroethylene-based polymer and a polymer compound having ionic groups, wherein the content of the ionic groups is 0.020 meq / g or more relative to the tetrafluoroethylene-based polymer composition.

The present application relates to multi-walled carbon nanotube in-situ composite polyurethane and its preparation method, and belongs to the technical field of lithium ion battery materials. The present application solves the technical problem of providing a multi-walled carbon nanotube in-situ composite polyurethane, which facilitates the dispersion of carbon nanotubes. The polyurethane is formed by polymerization of polyurethane prepolymer and multi-walled carbon nanotubes, the end group of the polyurethane prepolymer is isocyanate group, and the multi-walled carbon nanotubes contain active groups that react with the end group of the polyurethane prepolymer. The polyurethane of the present application is grafted with carbon tubes in-situ, combined in the form of covalent bond, avoids the aggregation of carbon tubes, and improves the stability of the slurry. During the emulsification process, the carbon tubes penetrate through the entire latex particle, which is beneficial to the electron transport of the system. The polyurethane of the present application can be used as a negative electrode adhesive after being blended with PAA, which can avoid the negative influence on the peeling force and electrical performance caused by the introduction of small molecules. The adhesive can not only increase flexibility, but also reduce the DCR of the battery, and improve the charge-discharge performance.

The invention relates to a flexible polyethoxylated acrylate negative electrode binder as well as a preparation method and application thereof. The flexible polyethoxylated acrylate negative electrode binder comprises the following components in percentage by weight: 30-60% of a flexible unit and 40-70% of a rigid unit. The flexible unit is an ethoxylated acrylate monomer, and the rigid unit is one or more of acrylic acid and acrylamide. The binder can realize the characteristic of combining hardness and softness, not only ensures the adhesive force, but also has certain flexibility, can effectively inhibit the volume expansion of silicon, increases the usage amount of a silicon-based material to 60% or above, and is green, environment-friendly and low in price.

This invention discloses a lithium-ion battery anode adhesive and its preparation process, relating to the field of fine chemicals. It comprises the following raw materials in parts by weight: 90-100 parts SBR latex, 20-30 parts polyacrylate latex, 2-5 parts conductive polymer, 0.5-2 parts grafted catalyst, and 2-4 parts CMC. The preparation method is as follows: SBR latex, polyacrylate latex, conductive polymer, and grafted catalyst are stirred in a low-speed homogenizer. CMC is added, and stirring continues until a stable and dispersed emulsion is obtained. The lithium-ion battery anode adhesive provided by this invention can effectively inhibit pulverization and delamination, maintain the integrity of the conductive network, thereby improving the cycle performance of the anode material and extending the battery cycle life.

This invention relates to the field of electrode manufacturing technology and discloses an electrode adhesive application device and its processing technology. The device includes an adhesive application machine body, inside which a drive assembly, an adhesive application assembly, and a smoothing assembly are installed. The output end of the drive assembly is connected to the adhesive application assembly. During the return stroke of the adhesive application assembly, the depth difference between the application groove and the smoothing groove drives the adhesive application assembly to move upwards and separate from the electrode. Simultaneously, the linkage of the connecting arm drives the smoothing assembly to move downwards and adhere to the electrode. Furthermore, the friction wheel and friction plate only engage during the return stroke, driving the pressing roller to rotate and precisely smooth the freshly applied adhesive. The smoothing operation is completed during the idle time of the return stroke, eliminating the need for an additional drive mechanism to control the start and stop of the smoothing assembly. This shortens the overall operation cycle and ensures that the adhesive is evenly pressed within a short time after application, reducing problems such as air bubbles, lifting, and misalignment. This significantly improves the flatness and adhesion of the electrode adhesive application, ensuring the quality of subsequent electrode processing.

The present invention relates to a separator substrate, a separator, an electrode assembly, and an electrochemical device, and the separator substrate according to one embodiment of the present invention is characterized in that both surfaces have different surface characteristics, thereby resulting in different adhesive strengths on both surfaces of a separator using the separator, which significantly reduces variations in electrode adhesive strength between a positive electrode and a negative electrode, which have different adhesive strengths.

The invention provides a positive electrode glue solution for a lithium thionyl chloride battery as well as a preparation method and application of the positive electrode glue solution. The positive electrode glue solution comprises the following components in parts by weight: 1-2 parts of polyacrylate, 1-3 parts of conductive filler and 8-16 parts of dispersion medium. The positive electrode glue solution developed by the invention has the characteristics of simple and controllable components and excellent batch consistency; by introducing the polyacrylate with a specific proportion, the adhesive solution ensures high bonding strength and remarkably reduces interface corrosion to a lithium thionyl chloride system, and the unique corrosion resistance of the adhesive solution enables a bonding layer to stably exist in a thionyl chloride environment for a long time, so that the adhesive solution has a good anti-corrosion effect on the lithium thionyl chloride battery system, and the service life of the lithium thionyl chloride battery system is prolonged. The influence of a reaction product of a traditional bonding layer and thionyl chloride on the performance of a lithium thionyl chloride battery is avoided, and the structural stability of the positive pole piece is greatly improved. The lithium thionyl chloride battery prepared based on the method has excellent long-term storage stability, and the battery capacity and hysteresis performance after long-term storage are obviously improved.

The present application relates to a kind of gelatin-based carbon dot complex preparation method and its application.Gelatin-based carbon dot complex preparation method includes the following steps: gelatin is added to solvent and swells after dissolving, obtain gelatin liquid;Gelatin liquid is placed in hydrothermal kettle, after certain temperature incubation, obtain product liquid after hydrothermal;After product liquid after hydrothermal is placed in centrifuge, after centrifugation, take out supernatant;Again, the supernatant is dried to obtain the gelatin-based carbon dot complex of the present application.The gelatin-based carbon dot complex of the present application can be used as electrode adhesive, it is beneficial to reduce zinc manganese battery positive pole impedance, polymer layer can form network structure, it is beneficial to keep positive pole structure stable, and the electrode prepared has high specific capacity and excellent cycle stability.

The invention discloses a water-based polyurethane negative electrode adhesive for a lithium ion battery as well as a preparation method and application of the water-based polyurethane negative electrode adhesive. The negative electrode adhesive is prepared from the following raw material components in parts by weight: A, polyisocyanate; b, a polyhydroxy polymer; c, a substance containing a hydrophilic group or a hydrophilic potential group and having more than one reactive hydrogen; d, a chain extender containing reactive hydrogen; e, a polyethyleneimine post-crosslinking agent; f, an optional catalyst. The waterborne polyurethane negative electrode adhesive provided by the invention not only is strong in adhesive force and high in mechanical strength, but also can effectively resist swelling of an electrolyte, and is beneficial to keeping the adhesive force to an active substance in a battery; in addition, when the waterborne polyurethane negative electrode adhesive is used as the negative electrode adhesive of the lithium ion battery, gas production in the formation process of the lithium ion battery can be reduced, and the condition of swelling of the soft package battery can be improved.

The present application relates to a kind of positive electrode slurry with dispersing anti-gel function PVDF material, wherein the PVDF material has the following structural formula:;Wherein, in the above structural formula, G1 is co-grafted functional part, including but not only limited to vinyl trimethoxysilane, styrene ethyl trimethoxysilane, 3- (methacryloyloxy) propyl trimethoxysilane, vinyl tri (2-methoxyethoxy) silane, (4-vinylphenylmethyl) trimethylsilane and so on one or more. The PVDF material can significantly improve the dispersion stability of existing lithium battery positive electrode slurry without introducing more additive functional parts, enhance the anti-gel properties of slurry, and increase the applicability of lithium battery positive electrode adhesive in different slurry systems.

The invention relates to the technical field of negative electrode adhesives, in particular to an acrylic acid negative electrode adhesive and a preparation method thereof. The preparation raw materials comprise an acrylic polymer solution and a polyurethane polymer solution. The acrylic polymer solution is prepared from the following raw materials: a hydrophilic vinyl compound, a hydrophobic vinyl compound, a vinyl compound containing an amide group, water, a neutralizer and an initiator; the polyurethane polymer solution is prepared from the following raw materials: diisocyanate, a catalyst, a polymer containing active hydroxyl and an organic solvent. The negative electrode adhesive prepared by the method has low modulus and high adhesive performance, is applied to battery negative electrode adhesion, effectively buffers the volume change of a negative electrode material during charging and discharging, and maintains the structural integrity of an electrode.

The utility model belongs to the technical field of inductor paint spraying pretreatment, and particularly relates to an inductor electrode adhesive tape pressing mechanism which comprises a width-adjustable track assembly and a pressure-adjustable pressing assembly, the track assembly can be adjusted according to the width of an inductor and the width of an adhesive tape, and the pressing force of the pressing assembly on the adhesive tape can be adjusted. The track assembly comprises a lower track and an upper track sliding on one side of the upper end of the lower track. The rail is divided into an upper part and a lower part, a designed upper rail boss is matched with a lower rail guide groove, the width of the rail can be adjusted left and right, and the use flexibility and practicability are improved; the two sides are in rolling connection through bearings, the polyurethane rubber wheels can be disassembled and assembled from the two sides of the rubber wheel rotating shaft respectively, the polyurethane rubber wheels are directly replaced after being abraded, and the maintenance cost is reduced; the original rubber wheel is an independent assembly, centrality and gaps need to be independently debugged, maintenance is time-consuming and labor-consuming, after the existing rubber wheel assembly is assembled, left and right gaps are directly and symmetrically matched with a track after being installed according to design, and debugging is not needed after overall fixed connection.